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April 3rd, 2014, 04:48 PM   #1
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Functions

If F(x)=2x+2

Simplify when a. f(-x) and b. f(x^2)

Im just unsure if i should be substituting in a '-x' in to the equation or i have to multiply the whole equation against the negative sign.

Same goes for f(x^2).

Can someone please push me in the right direction?

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April 3rd, 2014, 06:44 PM   #2
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I take it you meant f(x) rather than F(x).
(a). f(-x) = 2(-x) + 2 = -2x + 2
(b). f(x²) = 2(x²) + 2 = 2x² + 2
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April 4th, 2014, 02:19 AM   #3
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$\displaystyle f(-x)\,=\,-2x\,+\,2$
$\displaystyle f(x^2)\,=\,2x^2\,+\,2$
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